CN1083958C - Pressure tube of plastic material - Google Patents
Pressure tube of plastic material Download PDFInfo
- Publication number
- CN1083958C CN1083958C CN97195006A CN97195006A CN1083958C CN 1083958 C CN1083958 C CN 1083958C CN 97195006 A CN97195006 A CN 97195006A CN 97195006 A CN97195006 A CN 97195006A CN 1083958 C CN1083958 C CN 1083958C
- Authority
- CN
- China
- Prior art keywords
- pressure tube
- multilayer pressure
- weight
- multilayer
- layers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/045—Hoses, i.e. flexible pipes made of rubber or flexible plastics with four or more layers without reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/33—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles with parts rotatable relative to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/46—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using vanes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/123—Rigid pipes of plastics with or without reinforcement with four layers
Abstract
The invention relates to a multi-layer pressure pipe (20) of a plastic material. The multi-layer pressure pipe is extruded by using an extruder (10), which cross-orients the reinforcement fibers in the extruded material in the successive layers (21,22,23,24), and that the material extruded is a polyolefin which contains fiber reinforcements.
Description
The present invention relates to a kind of multilayer pressure tube of plastic material.
Pipe for example is used to transmit liquids and gases and is used in machine and equipment as various parts, and delivery means is in building industry or the like.In many application, use plastic tube bigger superiority to be arranged than metal tube.Compare metal tube, the typical advantages of plastic tube is that it is in light weight, and is corrosion-resistant, the plasticity in the manufacture process and electricity and heat insulation performance.
Usually plastic tube is extruded manufacturing.The most frequently used manufacture method of reinforced plastic pipe has pulse to extrude, and twines rolling or compression moulding.
Non-reinforced plastic pipe is for example by PVC, polyethylene, polypropylene, polybutylene and crosslinked polyethylene manufacturing.The reinforced plastic pipe is usually by glass fibre with as polyester, and thermoset plastic material such as vinyl acetate or epoxy prepare.
Can obtain with thermoplastic pipe as everybody knows in light weight, corrosion resistant structure.And relate to the typical problem of thermoplastic pipe is that mechanical strength is low, and carrying the time is easy to creep.
Their impact resistance is relatively poor at low temperatures in addition, and pipe wants withstand voltage must make heavy wall.
On the other hand, known use reinforced plastic pipe can obtain withstand voltage and rigid construction.But, the reinforced plastic pipe destruction that is easy to be hit, they lose the mechanical strength properties of part subsequently, and environmental impact factor is become responsive, for example corrosion.And the wear resistance of reinforced plastic pipe is low under certain conditions.
Attempted strengthening thermoset layer manufacturing composite pipe, with the more weak performance of being mentioned above improving by around thermoplastic tube, forming one.With the tubing of manufacturing like this, can obtain inner preferably wear resistance, chemical resistance, and resistance to pressure and rigidity preferably.But the typical fragility of thermosetting plastics institute causes tubing to be easy to concussion fracture.In this case, the outer tubing of thermosetting plastics may break, and structure descends with regard to corrosion-vulnerable and mechanical strength subsequently.In addition, the interface between thermosetting property pipe and the thermoplastic pipe does not obtain enough strong combination, so meeting generation delamination in the boundary when pipe is subjected to enough big stress (, separate between the layer).This phenomenon can cause pipe mechanical strength and chemical strength all to descend.
In addition, attempted mixing use with different order mutually by thermosetting plastics pipe and thermoplastic pipes, to remedy the weakness of above-mentioned plastic tube, perhaps thermoplastic pipe mixes use so that their interface can combine each other firmly with other thermoplastic pipe or thermosetting property pipe.But these structures are not eliminated the discontinuous point that the interface causes from pipe, and the structure reduction that these discontinuous points have caused thermal expansion coefficient or elongation by above-mentioned impact failure, different kind of material to cause.
In order to eliminate the discontinuous point of joint between the pipe different layers, publication US-3900,048 discloses a kind of method of making the reinforced plastic pipe, wherein connects the thermoplasticity non-cross-linked polymer that glass fibre strengthens by solvent around the thermoplasticity core tube.According to disclosed method in this publication, by between the solvent layer clearly the interface can disappear.
The success of publication US-3900,048 is that the polymeric matrix in hypothesis thermoplastic pipe and the glass fiber reinforced polymer layer is a soluble.But in tubing, also use material insoluble or the ten minutes indissoluble usually.In many situations, polymer dissolution is time-consuming, and therefore such method often is to be not suitable for practical application.And, in pipe, may leave undesirable residue that uses solvent.
Finnish patent application 933877 discloses a kind of thermoplastic composite tubing, it have a thermoplasticity core tube and be centered around around it by a kind of thermoplastic material and the composite material made of reinforcing fiber continuously.Thermoplasticity core tube and the composite material of being made by a kind of thermoplastic material and continuous reinforcing fiber that centers on jointlessly fuse together each other.
The thermoplastic matrix polymers of composite material is heated to the fusion point of thermoplastic material to produce jointless the connection with (when needing) thermoplasticity core tube in the joint.
The preparation thermoplastic composite tube be by twine can around the composite material of song (by a kind of thermoplastic material and continuously reinforcing fiber make) around the thermoplasticity core tube, winding angle is 0～180 ° or the different angle of different layers selection, and preferred composite materials can be wound in the angle of smooth one deck.
The preparation thermoplastic composite tube can on selected thermoplasticity core tube, be coated with by the what is called connecting means of in Finnish patent application 933877, describing in advance add by a kind of thermoplastic material and continuously reinforcing phase make composite material, its mode is for causing the banded composite material of suitable width (width is selected according to the diameter and the selected winding angle of core tube) edge of rotary core pipe from spool.Before causing the core tube surface, composite material is heated to the no seam fusion that softening temperature or melt temperature can obtain composite material tape and thermoplasticity core tube.And also can heat on the core tube surface of welding point so that the pipe outermost surface is in the temperature that softening and/or fusion occur.The composite material belt tension that welding between the molten state thermoplastic phase can be wrapped in by the place of meeting in fusion around the core pipe guarantees that tension force produces pressure and helps welding.When the fusion passing point of composite material and core tube from the melt temperature cooling and when above-mentioned composite material tape was still tightened simultaneously, welding had just taken place.And then first composite layer on blank heat-flash plastic tube edge carries out the welding of multilayer materials layer in the corresponding way.Also can be pressed into the type pipe to guarantee welding with nip drum etc. at welding point.
Plastic drain-pipe as pvc pipe, has used the extruder manufacturing as you know.The intensity of such waste pipe is that the amount by employed additive and additive in the extruded material decides.But when using traditional axial single screw extrusion machine, reinforcing fiber can only be placed with pipe axial orientation direction.The flexural strength of pipe is still very low thus.
In the disclosed so-called winding technology, reinforcing fiber such as glass fibre are short fibres in Finnish patent application 933877, generally are in the millimeter magnitude.And the rapid preparation method's cost of this multistep height, it is not the best approach of preparation pressure tube thus.
Pressure tube is divided into the different pressures grade.Use manufacturing technology now, the pressure rating of pressure tube (PN) generally is 6,8 and 10.The melt viscosity MFR for preparing the raw materials for plastics production of traditional pressure tube
2(melt flow rate (MFR)) is normally very low, is generally less than 1.
The purpose of this invention is to provide the improvement of current known technology.Specific purposes provide a kind of plastic pressure pipe, and its pressure rating is higher than existing corresponding pipe widely.
The objective of the invention is to realize that pipe is characterised in that the multilayer pressure tube is to use extruder for shaping, the reinforcing fiber of extruder cross arrangement material continuous horizon by means of the multilayer pressure tube of plastic materials.The material of being extruded is the polyolefin that contains the long fibre reinforce.
Thought of the present invention is to use polyolefin as extruded material, polypropylene for example, and it contains a certain amount of long fibre reinforce, is generally 5～95% weight, and preferred 25～75%.In long fibre strengthened, length of staple was 30 times of fiber diameter at least.Reinforcing fiber length in the pressure tube is in 0.5～50 millimeter magnitude, and preferred 1～20 millimeter, most preferably 2～15 millimeters.Employed reinforcing fiber also may be the continuity fiber that ruptures in extrusion process.And, extruder will be in the continuous horizon of institute's extruded material the cross arrangement reinforcing fiber.The number of plies of pipe product of the present invention is 2 layers or more.The material melt viscosity MFR that in pipe production of the present invention, uses
2Greater than 1, preferably as 10～18.
In the present invention, " polyolefin " is meant that a kind of polyolefin accounts for the polymer of major part (at least 50% weight).Therefore all the other also may be some other thermoplastic polymers.
In manufacture course of products of the present invention, preferably use so-called taper extruder, it for example arranges continuous glass-fiber with different directions in different layers, and the structure of product of the present invention can be stronger as a result.This product can bear pressure better at tube interior, can obtain for example pressure rating PN16 in this case, and 18,20 and 22, in addition higher.
Selection scheme of the present invention has many important superiority.The intensity of product of the present invention is better than the intensity of the corresponding product made from art methods significantly.The present invention can use extruder technology.Employed extruded material can comprise polyolefin, rather than the PVC material, and the processibility of avoiding being harmful to factor of environmental and product thus is much better.
According to the present invention, can make multilayer tubing, wherein be that no seam connects so that each layer can not separate each other between each layer.On the contrary, when for example using existing band winding technology, different layers may separate each other, and the present invention can access desirable surface properties and not reduce intensity.Therefore the surface of product of the present invention can be level and smooth, coarse, chemical-resistant reagent or the like.
In pressure tube of the present invention, but different layers may be different extruded materials.But preferably all layers use the polyolefin of same kind, therefore can be solved best in conjunction with problem between the layer.Can use polypropylene as internal layer or all layers in multilayer pressure tube of the present invention, pipe has high corrosion resistance and high heat resistance like this.
The present invention will be described in detail with reference to the principle of being described in the accompanying drawings of the present invention, though purpose is not that the present invention only is limited to this.
Fig. 1 is the sectional schematic diagram in the embodiment of the preferred equipment that uses in the manufacture course of products of the present invention.
Fig. 2 is the sectional schematic diagram of four-layer structure product of the present invention.
In Fig. 1, it is shown with reference to digital 10 that extruder is generally.Extruder 10 is so-called taper extruders, and it is for example in publication US-5,387, description is arranged in 386.Extruder 10 has stator 11 and 12, and rotor 13.The material inlet of being extruded is 14 shown.Shown reinforced passage with reference to digital 15.Material is melted after charging, and is compressed the last extrusion pressure of generation.Extrude passage for shown with reference to digital 16.
When material inflow feeding-passage 15, the pressure of material changes in following mode.At the feeding zone of next-door neighbour's charging inlet, pressure rises to for example 3～7MPa.In the melting zone behind feeding zone, pressure rises to for example 6～14MPa.Last compressing area behind melting zone, extrude passage 16 fronts a bit on, pressure rises to for example 10～60MPa.
The extruder of Fig. 1 can be used to make double-layer product.
When using the extruding means of in Finnish patent 83184, describing (it has 3 stators and 2 rotors), can make 4 layers of constructed products.Increase the number of stator and rotor, therefore can make the multi-layer structure product of the desired number of plies.
Because so-called taper extruder is familiar with by everybody, as publication US-5,387,386 and FI-83184 in description is arranged, so the structure of taper extruder just is not described in detail here.
It is shown with reference to digital 20 that pressure tube constructed in accordance depicted in figure 2 is generally.In this embodiment, pressure tube 20 comprises layer 21 (it constitutes the superficies of pressure tube), and layer 22 and layer 23 constitute the core 1 and the core 2 of pressure tube respectively.Layer 24 constitutes the internal surface of pressure tube.
Subordinate list 1 has shown test result, and sample 1 and 2 is 4 layers of infrastructure product of the present invention.Sample 3 is a reference sample, and sample 4 is 2 layers of infrastructure product of the present invention.
Table 1 has shown that the sample 4 with 2 layers of structure obtains best intensity, and this is that extruder will keep the long fibre performance of reinforcing fiber, interrupt and be extruded machine at 4 layers of infrastructure product medium-length fibre because in 2 layers of infrastructure product.And in table 1 as can be seen even can't specimen 3.This reference sample is to be made by the short fibre mixture of buying, and sample is very crisp so that even can't be connected on the test instrument.
Table 2 has shown that the sample 5～10 of 2 layers of infrastructure product of the present invention obtains fabulous strength character.Sample 11 is a kind of reference samples, and it has clearly illustrated does not have long fibre to strengthen, and the intensive property of product is very low.Sample 12 also is a reference sample, and it has shown that the intensive property of 2 layers of infrastructure product is relatively low, although employed extruded material is a material of the present invention when using single screw extrusion machine.
Described above only is principle of the present invention.Clearly to those skilled in the art, can carry out many improvement in the invention thought of in attached claims, stating.
Table 1 rupture time (hour)
+ for stop-＞for continuous * be that brittle fracture ° is ductile fracture sample 1: outer surface polypropylene 75% weight reinforcing fiber 25% weight
| +20℃ | +80℃ | ||||
| Material | 18MPa | 20MPa | 22MPa | 8.5MPa | 8.75MPa |
| Sample 1 | 667-＞ | 430-＞ | |||
| Sample 2 | 282+ | 222+ | 69 * | 210+ | 13.0 * |
| Sample 3 | |||||
| Sample 4 | 282+ | 218+ | 786-＞ | ||
Core 1 polypropylene 50% weight reinforcing fiber 50% weight
Core 2 polypropylene 50% weight reinforcing fiber 50% weight
Internal surface polypropylene 75% weight reinforcing fiber 25% weight sample 2: outer surface polypropylene 100% weight reinforcing fiber 0% weight
Core 1 polypropylene 50% weight reinforcing fiber 50% weight
Core 2 polypropylene 50% weight reinforcing fiber 50% weight
Internal surface polypropylene 100% weight reinforcing fiber 0% weight sample 3: outer surface polypropylene 100% weight reinforcing fiber 0% weight
Core 1 polypropylene 100% weight reinforcing fiber 0% weight
Core 2 polypropylene 100% weight reinforcing fiber 0% weight
Internal surface polypropylene 100% weight reinforcing fiber 0% weight sample 4: layer 1 polypropylene 50% weight reinforcing fiber 50% weight
Layer 2 polypropylene 50% weight reinforcing fiber 50% weight
Table 2 rupture time (hour)
+ for stop-＞for continuous * be that brittle fracture ° is ductile fracture
| Taper extruder polypropylene/reinforcing fiber % weight/% | 20 ℃ of tensile stress/ | 60 ℃ of tensile stress/ | 95 ℃ of tensile stress/MPa 5.0 |
| Nyte 5 50/50 Nyte 6 50/50 Nyte 7 50/50 Nyte 8 70/30 Nyte 9 70/70 Nyte 10 25/75 Nyte 11 100/0 Nyte 12 50/50 | 1602+ 6510 * 5717 * 10312 * 4624 * 6057+ 10717+ 13.8° 135.6 * | 413 * 820 * 657 * 131 * 205 * 871.4 * 0.3° 18.7 * 20.9 * | 224 * 203.5 * 336 * 114.9 * 136.9 * 431 * 1.6° 18.5 |
Claims (20)
1. the multilayer pressure tube (20) of a plastic material, contain fiber-reinforced layer, it is characterized in that, multilayer pressure tube (20) is by taper extruder (10) extruding and moulding, extruder is at the continuous horizon (21,22,23 of extruded material, 24) cross arrangement reinforcing fiber in, the material of being extruded is the polyolefin that contains fabric reinforcement.
2. the multilayer pressure tube of claim 1 is characterized in that, polyolefinic melt viscosity (MFR
2) greater than 1, preferred 10～18.
3. the multilayer pressure tube of claim 1 is characterized in that this structure (20) is is 16 or higher pressure tube according to SFS3134 standard pressure levels PN.
4. the multilayer pressure tube of claim 2 is characterized in that this structure (20) is is 16 or higher pressure tube according to SFS3134 standard pressure levels PN.
5. the multilayer pressure tube of any one in the claim 1～4 is characterized in that polyolefin is that polypropylene and long fibre reinforce are glass fibre.
6. the multilayer pressure tube of any one in the claim 1～4, the length that it is characterized in that the long fibre reinforce is 30 times of fiber diameter at least.
7. the multilayer pressure tube of claim 5, the length that it is characterized in that the long fibre reinforce is 30 times of fiber diameter at least.
8. the multilayer pressure tube of any one in the claim 1～4 is characterized in that the length of pressure tube medium-length fibre reinforce is in 0.5～50 millimeter magnitude, preferred 1～20 millimeter, and most preferably 2～15 millimeters.
9. the multilayer pressure tube of claim 5 is characterized in that the length of pressure tube medium-length fibre reinforce is in 0.5～50 millimeter magnitude, preferred 1～20 millimeter, and most preferably 2～15 millimeters.
10. the multilayer pressure tube of claim 6 is characterized in that the length of pressure tube medium-length fibre reinforce is in 0.5～50 millimeter magnitude, preferred 1～20 millimeter, and most preferably 2～15 millimeters.
11. the multilayer pressure tube of any one in the claim 1～4, the content that it is characterized in that the long fibre reinforce be at 5～95% weight ranges, preferred 25%～75% weight.
12. the multilayer pressure tube of claim 5, the content that it is characterized in that the long fibre reinforce be at 5～95% weight ranges, preferred 25%～75% weight.
13. the multilayer pressure tube of claim 6, the content that it is characterized in that the long fibre reinforce be at 5～95% weight ranges, preferred 25%～75% weight.
14. the multilayer pressure tube of claim 8, the content that it is characterized in that the long fibre reinforce be at 5～95% weight ranges, preferred 25%～75% weight.
15. the multilayer pressure tube of any one in the claim 1～4 is characterized in that structure (20) is 2 layers of structure.
16. the multilayer pressure tube of claim 5 is characterized in that structure (20) is 2 layers of structure.
17. the multilayer pressure tube of claim 6 is characterized in that structure (20) is 2 layers of structure.
18. the multilayer pressure tube of claim 8 is characterized in that structure (20) is 2 layers of structure.
19. the multilayer pressure tube of claim 11 is characterized in that structure (20) is 2 layers of structure.
20. the multilayer pressure tube of claim 15 is characterized in that structure (20) is 4 layers of structure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI961834A FI961834A (en) | 1996-04-30 | 1996-04-30 | Pressure pipe made of plastic material |
| FI961834 | 1996-04-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1220001A CN1220001A (en) | 1999-06-16 |
| CN1083958C true CN1083958C (en) | 2002-05-01 |
Family
ID=8545937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97195006A Expired - Fee Related CN1083958C (en) | 1996-04-30 | 1997-04-29 | Pressure tube of plastic material |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0897501A1 (en) |
| JP (1) | JP2000509132A (en) |
| CN (1) | CN1083958C (en) |
| AU (1) | AU2390697A (en) |
| CA (1) | CA2252932C (en) |
| FI (1) | FI961834A (en) |
| RU (1) | RU2191314C2 (en) |
| WO (1) | WO1997041376A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2412708B (en) * | 2004-04-02 | 2009-07-22 | Uponor Innovation Ab | Plastics pipe |
| US8487045B2 (en) * | 2008-12-24 | 2013-07-16 | Basell Poliolefine Italia S.R.L. | Pressure pipes and polyolefin composition for the manufacture thereof |
| TR201112610T1 (en) * | 2009-06-19 | 2012-09-21 | Obschestvo S Ogranichennoy Otvetstvenostyu <<Alterplast>> | Multilayer plastic pipe for water supply and heating systems. |
| DE102009057856A1 (en) * | 2009-12-11 | 2011-06-16 | Carl Freudenberg Kg | Laundry equipment |
| JP6546433B2 (en) * | 2015-04-03 | 2019-07-17 | 積水化学工業株式会社 | Multilayer piping |
| BR112018071000A2 (en) * | 2016-04-15 | 2019-01-29 | Cc3D Llc | head for a continuous fabrication system, continuous fabrication system and continuous fabrication methods |
| CN107504282A (en) * | 2017-09-30 | 2017-12-22 | 镇江市星耀智能装备有限公司 | A kind of high-efficiency insulated pipe |
| KR102059920B1 (en) * | 2019-05-10 | 2020-02-11 | 조현진 | Apparatus for pressurized extraction comprising expansion tube |
| CN114126854A (en) * | 2019-05-21 | 2022-03-01 | 都明泰 | Multilayer composite board of discrete material and plastic |
| JP7339803B2 (en) * | 2019-07-29 | 2023-09-06 | 積水化学工業株式会社 | Piping |
| JP7417374B2 (en) * | 2019-07-29 | 2024-01-18 | 積水化学工業株式会社 | Piping |
| CN113400696B (en) * | 2021-06-26 | 2022-02-22 | 宜宾学院 | Method for connecting large-caliber high-pressure fiber reinforced flexible composite pipe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3279501A (en) * | 1965-01-28 | 1966-10-18 | Dow Chemical Co | Extrusion and product |
| US3651187A (en) * | 1969-10-16 | 1972-03-21 | Hercules Inc | Extrusion process |
| DE2551525A1 (en) * | 1974-11-20 | 1976-05-26 | Akzo Gmbh | Extrusion of thermoplastic pipe - incorporating circumferentially oriented fibres by extrusion between spinning die walls |
| US4056591A (en) * | 1973-12-26 | 1977-11-01 | Monsanto Company | Process for controlling orientation of discontinuous fiber in a fiber-reinforced product formed by extrusion |
| GB2096533A (en) * | 1981-04-14 | 1982-10-20 | Nat Res Dev | Improvements in or relating to extrusion |
-
1996
- 1996-04-30 FI FI961834A patent/FI961834A/en unknown
-
1997
- 1997-04-29 JP JP9538617A patent/JP2000509132A/en not_active Ceased
- 1997-04-29 CN CN97195006A patent/CN1083958C/en not_active Expired - Fee Related
- 1997-04-29 CA CA002252932A patent/CA2252932C/en not_active Expired - Fee Related
- 1997-04-29 EP EP97919423A patent/EP0897501A1/en not_active Ceased
- 1997-04-29 RU RU98121430/06A patent/RU2191314C2/en not_active IP Right Cessation
- 1997-04-29 AU AU23906/97A patent/AU2390697A/en not_active Abandoned
- 1997-04-29 WO PCT/FI1997/000255 patent/WO1997041376A1/en not_active Application Discontinuation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3279501A (en) * | 1965-01-28 | 1966-10-18 | Dow Chemical Co | Extrusion and product |
| US3651187A (en) * | 1969-10-16 | 1972-03-21 | Hercules Inc | Extrusion process |
| US4056591A (en) * | 1973-12-26 | 1977-11-01 | Monsanto Company | Process for controlling orientation of discontinuous fiber in a fiber-reinforced product formed by extrusion |
| DE2551525A1 (en) * | 1974-11-20 | 1976-05-26 | Akzo Gmbh | Extrusion of thermoplastic pipe - incorporating circumferentially oriented fibres by extrusion between spinning die walls |
| GB2096533A (en) * | 1981-04-14 | 1982-10-20 | Nat Res Dev | Improvements in or relating to extrusion |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2191314C2 (en) | 2002-10-20 |
| CA2252932C (en) | 2006-12-19 |
| AU2390697A (en) | 1997-11-19 |
| CA2252932A1 (en) | 1997-11-06 |
| FI961834A0 (en) | 1996-04-30 |
| WO1997041376A1 (en) | 1997-11-06 |
| FI961834A (en) | 1997-10-31 |
| JP2000509132A (en) | 2000-07-18 |
| CN1220001A (en) | 1999-06-16 |
| EP0897501A1 (en) | 1999-02-24 |
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